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MYSQL Tutorial

MySQL NOT operator

NOT operator

MySQL NOT operator reverses or negates the input.

Syntax:

NOT, !

The operator returns 1 if the operand is 0 and returns 0 if the operand is nonzero. It returns NULL if the operand is NOT NULL.

MySQL Version: 5.6

Example: MySQL NOT operator

In the following MySQL statement, NOT operator negates the input 10, it returns 0.

Code:

SELECT ! 10;

Output :

Example of MySQL NOT operator with zero input

In the following MySQL statement, NOT operator negates the input 0, it returns 1.

SELECT ! 0;

Sample Output:

MySQL> SELECT ! 10;
+------+
| ! 10 |
+------+
|    0 | 
+------+
1 row in set (0.00 sec)

Example of MySQL NOT operator with zero input

In the following MySQL statement, NOT operator negates the input 0, it returns 1.

Sample Output:

MySQL> SELECT ! 0;
+-----+
| ! 0 |
+-----+
|   1 | 
+-----+
1 row in set (0.00 sec)

Example of MySQL NOT operator with NULL

In the following MySQL statement, NOT operator negates the input NULL, it returns NULL.

SELECT ! NULL;

Sample Output:

 MySQL> SELECT ! NULL;
+--------+
| ! NULL |
+--------+
|   NULL | 
+--------+
1 row in set (0.00 sec)
 

Example of MySQL NOT operator with non-zero input

In the following MySQL statement, NOT operator negates the input (10+10), it returns 0.

SELECT ! (10+10);

Sample Output:

 MySQL> SELECT ! (10+10);
+-----------+
| ! (10+10) |
+-----------+
|         0 | 
+-----------+
1 row in set (0.00 sec)
 

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